/Engine/Source/Runtime/CoreUObject/Public/Serialization/AsyncPackageLoader.h
Process all loading package requests until completion predicate is satisfied.
[EAsyncPackageState::Type](API\Runtime\CoreUObject\UObject\EAsyncPackageState__Type) ProcessLoadingUntilComplete ( [TFunctionRef](API\Runtime\Core\GenericPlatform\TFunctionRef)< bool()> CompletionPredicate, double TimeLimit )